From 955d3c77fa168df429eb965409dd135992a63b1b Mon Sep 17 00:00:00 2001
From: sjpsega <ssjjpp520@126.com>
Date: Wed, 7 Aug 2013 11:04:23 +0800
Subject: [PATCH] bugfix,in some spacial js environment,it will happen.

---
 underscore.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/underscore.js b/underscore.js
index 392a3509e..4c010578d 100644
--- a/underscore.js
+++ b/underscore.js
@@ -311,6 +311,9 @@
         criteria : iterator.call(context, value, index, list)
       };
     }).sort(function(left, right) {
+      if(left === right){
+        return 0;
+      }
       var a = left.criteria;
       var b = right.criteria;
       if (a !== b) {